Typewriting machine



sept. 15,1942. c; WALKER HAL 2,295,921-

TYPEWRITING MACHINE Filed July 1o, 1940 3 Sheets-Sheet 1 0x .m 0B #5 mWW? Y o e AU E mL/gm a 6 o .Q VW NJA HW m l Ww M. l l rffe l .rs A m 1 A0 f o an@ Sept. 151-942. c. WALKR ETL .TYPEWRI'TING MACHINE ssheets-sheet 2 1 Filed `July 10',V 1940 c. WALKER ETAL TYPEWRITINGMACHINE Filed July 10, 1940 :s sheets-sheet :s

Patented Sept. 15, v19,42

TYPEWRITING MACHINE Charles Walker and William A. Gabrielson, Syraeuse,N. Y., assignors to L. C. Smith & Corona Tmwriters, Inc., Syracuse,

. of New York N. Y., a corporation Application July 10, 1940, Serial No.344,766

14 (c1. 1er-s3) The invention relates to improvements in typewritingmachines, and more particularly to margin regulating mechanism forcontrolling .the limits of travel of the platen carriage in suchmachines.

An object of the invention is to provide-an improved margin regulatingmechanism wherein the rightand left hand margin stops may beindependently adjustedeither by direct hand manip-- ulation of the stopor stops or indirectly by handcontrolled stop-setting means selectivelyoperable upon the stops. f

Other objects of the invention are to provide improved margin stops foruse with'hand-controlled stop-setting means, and to providehandcontrolled margin stop setting means of improvedV construction andeciency.

A further object of the invention is to provide eilicient margin stopsetting mechanism of light and inexpensive construction for machineshaving so-called wide carriages as well-as for machines having carriagesof standard width.

To the foregoing and other ends which will hereinafter appear, theinvention consists of the improved devices, features' of construction,and arrangements yand combinations of parts hereinafter particularlydescribed and particularly pointed out in the appended claims.

The improvements have been illustrated as embodied in preferred `formsintwo known L. C. Smith typewriting machines having respectively a platencarriage of standard width and a wide platen carriage of approximatelydouble the standard carriage width.

In the drawings:

Fig. l'is a fragmentary front view of the machine having the carriage ofstandard width, certain known parts being broken away and others omittedfor clarity of illustration of the improvements, the margin regulatingmeans being shown in a normal position for use;

-Fig. 2 is a sectional view on the line 2-2 of Fig. 1;

Fig. 3 is a detail front view illustrating part of the margin stopsetting means located adjacent the right hand end of the carriage;

Fig. 4 isasectonal view on the line 4-4 Fig. 3;

Fig. 5 isa fragmentary top plan view of the margin regulating mechanism;

Fig. 6 is a rear view thereof;

Fig. 7 is a detail` sectional view on the line 1-1 of Fig. 6;

Fig. 8 is a' detail sectional view on the line 8-8 ofFig. 93

`Fig. 9 is a detail sectional view on, theline 9 9 of Fig. 6but showingthe right hand margin stop unlatched from the margin stop bar forsetting travel of the stop along the bar;

Fig. 10 is a sectionalview on the line I0-I0 of Fig. 6 showingthelefthand margin stop unlatched for setting travel along the stop bar;

Figs. 11 and .l2 are views similar to Fig. 4 showing` respectively thecontrol handle of the stop setting mechanism rocked to unlatch the righthand margin stop and rocked to unlatch the left hand margin stop;

Fig. 13 is a view similar to Fig. 1 showing a modified form of theinvention embodied in a wide carriage machine;

Fig. 14 is a sectional view on the line |4-I4 of Figz 13;` and Fig. 15is a detail perspective view showing certain parts of the right handmargin stop separated from each other, said parts being similar tocorresponding parts of the left` hand stop except where differences arepointed out hereinafter in the description.

'I'he improvements are shown kembodied in an L. C. Smith machineconstructed (except as modified by the present invention) substantiallyas shown and described in patent to Carl Gabrielson, No. 1,933,550,granted November 7, 1933. Said machine has mounted on the usual mainframe I0 thereof the usual platen carriage Il which travels transverselyof the machine and is controlled for letter space feeding from right toleft by the usual escapement device, the carriage carrying the usualfeed rack I2 through which it is fed step by step in letter spacedirection and held in different letter space positions by the escapementdevice. The usual platen roller I3 is journalled on the carriage in theusual manner for rotation about an axis I4.

The carriage also 4has held thereto the usual letter space scale I5, andthere is held to the main frame the usual indicator device IB having agraduation or index mark I6 for coaction with the graduations of scalei5 to indicate the letter space position occupied by the carriage. Theusual frame stop means or counter stop means for the margin stops on thecarriage is also/ mounted as usualon the main frame I0 substantiallymidway between the sides o! the machine, said counter stop meanscomprising the usual abutment members I1 and I8 for coactionrespectively with the left hand margin stop and the right hand marginstop` on4 the carriage. The

usual toothed ordentated margin stop bar I9 is adjustably held by screws2t to the usual pair of riage as usual by screws 22. The margin bar isprovided along its lower edge with the usual row oi' uniformly spacedteeth I9* for latching of the margin stops to the bar in differentletter space positions.

The machine is also preferably provided with the usual margin releasingmeans described and shown in said patent,` and the usual terminal orfinal stops disclosed in said patent are preferably mounted on the barI9 of the improved machine as indicated at 23 and 24 for carriagestopping coaction of stop 23 with a stop shoulder 25 on the main frameand for carriage stopping coaction of stop 24 with abutment I8, as isexplained in said patent.

The usual paper table or apron 26 is held to the carriage through tablecarried brackets 21 clamped to the carriage as usual by the screws 22,said table consisting as usual of two sections hingedly connected at 28for swinging forward of the upper table section to uncover the marginstops and stop bar.

The improvements will now be described, the embodiment of Figs. l to l2being first described, and then the modified embodiment of Figs. 13 and14.

Rigidly held to the brackets 2| on the carriage as by sc rews 29 are apair of bearing brackets 30 for an oppositely rockable margin stopunlatching bar 3|. This bar is formed of sheet metal asaaeai brackets2|, which 'brackets are held to the car- I machine.A An upstandingsingle leaf springl 33 which extends up past the offset 31n is rigidlyanchored at its lower end to the'front of the right hand bracket 2 I, asby 'a screw 39, with said spring above its anchorage spaced forwardlyfrom the bracket l2| and normally engaged adjacent its free upper endflatwisev against the :dat rear face of offset portion 31a of the handlearm 31 to normally restore to, and yieldingly hold the unlatchand is ofinverted U-shape or channel form in cross section, said bar extendingtransversely of the machine along the carriage above the stop bar I9with its side flanges or walls pendent and preferably flaring outwardand downward away from each other as shown. Rigidly held in the channelof bar 3| at each end of the vbar (as by rivets 32) are two trunnionblocks 33 each formed with a reduced trunnion 33B joumalled in abearinghole in the adjacent bracket 30 to support bar 3| for oscillation aboutan axis parallel to the stop bar I9.

To limit the extent of rocking movement of the unlatching bar 3| in bothdirections from the -normal idle position thereof shown in Figs. 1 to 7to the respective stop unlatching positions thereof one of which isshown in Figs. 9 and 11 and the other in Figs. 10 and 12, two sheetmetal stop arms 34 and 35 are provided for stopping engagement of arm 34with the front face of margin stop bar I9 and stopping engagement of arm35 with the rear face of bar I9 near the right hand end of said bar I9.These stop'arms 34 and 35 are rigidly held at their upper endsvto theright hand trunnion block 33 respectively at the front and rear faces ofsaid block by suitable means such as rivets 36 as indicated in Fig. 3.The lower ends of the stop arms 34 and 35 are spaced'from the stop barI!)V in the idle position of the bar, and said stop arms are permanentlybendable fore and aft of the machine to adjust the normal spacing of thelower end of each arm from the .adjacentface of barl9.

A sheet metal handle arm 31 formed integrally with the upper riveted endof stop arm 34 is provided for rocking the unlatching bar 3|. The handlecarrying arm is provided at its forward end with a suitable finger pieceor handle 31h and projects forwardly lbeyond the paper table 26adjacent-the right hand edge of the paper table for convenientmanipulation from the front of the machine.' Adjacent itsl Arearanchored end this handle arm is provided with a fiat-faced lateral ingbar and handle arm in, the intermediate idle position shown in Figs. 1to 7. Suitable indicia such as indicated at 40 in Fig. 1 are printed onthe front face of the paper table 26 adjacent the right hand edge of the.table for indicating the three positions of the unlatching bar and itsoperating handle.

Mounted on the margin stop bar I9 are the two adjustably settable marginstops L and R slidably adjustable independently along the stop bar andreleasably latchable to said bar in different letter space positions fordetermining the left and right hand margins of the writing to be done bythe' machine upon a work sheet. As the two stops are of generallysimilar construction, except as hereinafter explained to adapt them foruse as left and right hand stops, the general structure of the stopswill be described using like reference characters for like parts of thetwo stops L and R.

Each stop (L or R) comprises a stop body slidable along bar I9 andconsisting of parallel flat top and bottom walls 4I and 42 joined by aflat rear wall 43 integral with the top and bottom walls,- and adetachable flat front wall 44 detachably held to the front edge of thebottom wall by screws 45, the four fiat walls dening a rectangular stopbody having a passage of oblong crosssection therethrough from the rightto the left side of eachstop, which passage is just large enough toslidably receive the toothed stop bar |9-4-I9, as will be apparent fromFig. 7 for example. Said passage conforms substantially in cross-sectionto the cross-sectional contour of bar I9-I9l.

Each margin stop L or R also includes a releasable stop detent orlatchplunger device for latching the stop to the bar |9 in any selectedletter space position along the bar, it being understood that the teethI9* of bar I9 are uniformly spaced apart a distance equal to one letterspace movement of the carriage II under control of its escapement deviceas is usual vin the art.

Each detent device D comprises an upper operating head and a lowerlatching head rigidly connected by a stem toA which the heads arerigidly fixed. The stem and its rigidly united latching head of eachstop are generally similar to the corresponding parts of the adjustablemargin stops of the prior patent above referred to and need therefore tobe only lbriey described. 'I'he latching head consists of two parallelteeth 46 underlying the stop bar and spaced apart two letter spacedistances longitudinally of bar I9 and integrally joined at their rearends by a con- -necting bar 4 1, said head being guided to moveperpendicularly of the stop (edgewlse of bar I9) in I offset portion31extending transversely of the 75 Stop body and projecting above saidwan, The

l 7 for example.

ing bar 3|.

v stem is reduced within the stop bodyupward from the latching head toprovide a flat face 52 thereof iiush with the front face of the rearwall of the stop body and to provide a downwardly facing shoulderoverhanging the upper edge of the stop bar I9. At its upper end, andspaced above the stop body, .the stem 49 is formed with a reduced and,preferably, iiattened upper end portion 53 to which is fixed (at thelower end of said reduced end portion53) the operating head of thedetent device D.

The operating head of the detent device D of each margin stop includesan antifrction roller 55 and a head element 55 to which element and tothe reduced upper end 53 of the stem 49 the roller 55 is rotatably held,the element 55 being formed of a single piece of stiff sheet metalpermanently bent to partially surround the stop releasing or unlatchingbar 3|. In the construction shown the head element 55 consists of asheet metal strap or bar permanently bent laterally to form a bottomwall, a'front wall, a top wall, and `a rear wall which extends only partway upward from the bottom wall toward the rear edge of the top wall.The opening between the rear and top walls is wide enough for passage ofbar 3| therethrough to facilitate assembly of the parts. The bar 3l isrockable to its full extent of oscillationwithin the head elements 55without colliding with the walls of said elements. In the latchedposition of the margin stop with teeth 45 fully seated or meshed withteeth I9l of bar I9, the bar 3| `does not contact either the roller 55or the top wall or any other part of the head element, as will beapparent from Figs. 2 and To insure this, the stop arms 34 and 35 forbar 3| are adjustably bendable as `hereinbefore described. Roller 55 ofeach stop L or R is revoluble about an axle 51 ilxedly held to headelement 55 and stem portion 53, said axle and roller extending fore andaft of the machine perpendicular to the planes of the front and rearfaces of margin stop bar I9. The detent device D of each'stop isnormally forced up to latched position by a return spring 5I coiledaboutstem 49 between the bottom wall of head 55 and top wall 4| of the stopbody.

In the case of the left hand margin stop L the roller axle 51 is held toreduced stem part 53 and the rear wall of the head element 55, androller underlies the rear pendent flange of unlatch- Fixedly held to orformed on the rear wall 43 of the stop body of this stop is the usualabutment element or rearwardly extending projection 59 for abuttingframe stop element I1 to arrest return movement of the carf riage.

vstop bar which are normally covered by the proper table (see Fig. 2).To thus re-set either stop directly by hand it is simply necessary topress down on the top wall of the head element 55 of the` stop detent orlatch D with a finger of one hand, then move the finger in the necessarydirection longitudinally of the bar until the deu' sited position isreached by the unlatched stop and then release the stop latch D whichwill then rise under the influence of its return spring 5| Aand latchthe stop. A small aperture 13, smaller than the finger size rmay beprovided in the top wall of element 55 to facilitate lateral direct handshifting of the stop,

Resliently controlled tension means are -provided for automaticallydrawing either of the stops L and R towardv the other and toward` itscoactive counter stop element on the machine i frame when the stop isunlatched from the stop bar, the stop elements |1 and I5 on the framebeing located between the margin stops. 'I'his automatic power drive ofa released margin stop is effected in the construction shownby a smallspring drum 52 and drum cable or cord 53. Said drum is journalled on astub shaft 54 fixedly held to and projecting forward from the front wall44 of the stop body of yth`e right hand margin stop R, the drum beingheld on the shaft by a nut 55 threaded on the shaft. A spiral spring 55anchored to the stationary stub shaft and to the peripheral wall of thedrum constantly tends to rotate the drum clockwise as viewed in Fig. 1

and wind up the cable 53 upon the drum. The cable is anchored at one endto the drum and passes from right to left over the top of the drum, andthence under a small idle guide pulley 51 on stop R to the stop L whereit is tied or otherwise anchored to a stud 58 projecting forward fromthe front wall- 44 of the body of stop L. Pulley 51 is journalled on asmall stub shaft 59 projectving forward from and rigidly fixed to frontwall I9 until the spring drum and cable drives stop L rightward alongbarI9 up against stop I1 on the frame, and then release the handle armwhich will thereupon be restored to l"Loclr position by spring 35. Tore-set stop L for a narrower margin it is released and held released bya simii sition for the new margin with stop L engaged formed on the rearwall 43 of the stop body of l this stop is the usual rearwardlyextendingabutment element 59 for abutting frame stop element I9 t0 arrest letterfeed travel of the carriage from right to left in typing a line, saidrear wall 43 also having fixedly held thereto the usual alarm bellactuating lprojection `5II.`

Either of `the stops L and R may be released and adjusted along the stopbar and re-latched lar movement of handle arm 31 to "Lset position andheld released while the carriage is moved rightward to the desiredletter space po- With stop I1 thus shifting stop L leftward along thebar. Upon release of handle arm 31 the sto vL will be latched in its newposition. n

To re-set the right hand stop R for a wider margin the carriage is movedinto the proper letto said bar ina desired different letter spacedetermining position by direct hand manipulation after swinging of thehinged' upper section of paper table 25 forward to uncover the stops andter` space position and arm 31 is rocked downward and forward to theRset position and is held there with stop 34 abutting bar I9 while thespring drum and cable act to drive stop R along bar I9 towardv the leftup against stop Il, whereupon the stop-may becomelatched in its newposition by release of arm 31 which will then be restored by spring 35to Lock position. To reset stop R for a narrower margin the stop is reofeach of said stops.

leased andheld released as above described while the carriage is movedleftward to the desired letter space position with stop R engaged withstop I 8 to thereby shift stop R rightward along the bar, and the stopis then latched by releasing arm 31.

It will be observed that in all positions of the release bar 3l there isno contact between said bar and any part of the head element 56 ofeither stop L or R. It will also be observed that, while either stop Lor R is released, the sole contact between the released stop and therelease bar 3| is between the lower edge of one pendent flange of bar 3land the antifriction roller 55 of the detent device D of the releasedstop. It will be observed that in the normal position of the release bar3i there is no contact between the release bar and any part of either ofthe stops L or R including the roller 55 and the head element I6 The,limits of stop-releasing rocking movements of bar 3l are such that ateach such limit the latch device D of the released stop is depressedjust far enough for free clearance o`f teeth 48 from the teeth of barI9, and, preferably, also that the downwardly facing shoulder on stem I9overhanging the stop bar I9 does not contact the bar I9. Preferably,also, the top edge of bar I9 is rounded or convex transversely of thebar as shown. There is,

l therefore, a minimum of resistance to sliding of either stop L or Ralong the bar I9 upon release of the stop. It is thus possible to employa very small, light and :inexpensive spring drum 52 without any dan-gerof failure of the released stop to slide to its new position.

The construction of the head element 55 of the detent device D of eachstop L or R is such as to contribute to lightness and low cost of thestop as well as to permit either direct hand setting or indirecthand-controlled setting of each stop. The channel sheet metalconstruction of release bar 3| provides a very light bar which isnevertheless highly resistant to vsagging or bending.

The features of construction pointed out t eliminate friction, reduceexpense and size and weight, and provide a compact assembly,'are highlyimportant in mechanisms of the character to which the invention relates,and it is highly desirable in such mechanisms to not only keep down costbut to so construct the mechanism that it be light and compact yet bothsturdy in construction and certain in its operation.

Certainty of operation is exceptionally important in a mechanism forindirect, hand-controlled, semi-automatic stop setting, as in such vmechanism it is usually impossible for the operthis'difliculty, and saidmeans will now be described.

lIt is usual, if not in fact absolutely essential,

in returning the platen carriage of a typewriting machine, after letterfeed thereof by an escapement, that the usual abutment (such' as 58) onthe left hand settable margin stop (such as stop L) shall not contactits coactive abutment (such as I1) on the machine frame to stop thereturn of the carriage until the carriage has moved rightward in returndirection a fraction of one letterI space distance beyond the trueletter space position of the carriage for the left hand margin of thewriting, from which false or maximum return position the carriage ispulled back to the true position by the action of the usual spring drumof the escapement mechanism which urges the carriage leftward. Thisoverthrow return is required in order to insure the passage of theproper tooth .of the escapement rack or wheel past the normally engageddog o! the escapement.

According to the construction shown, there is provided in the left handmarginl stop L for overcoming the aforesaid difficulty an auxiliaryup-and-down shiftable abutment 1D in the form oi? a s heet metal fingerrigidly held at its upper end to the rear wall of head element 58 of thedetent device D of said, stop by the axle element 51 for the roller 55of said detent device. 'I'he element 51 clamps the upper end of abutmentfinger or slide 1Ii to said wall of head element 56, and said finger I0is held against swinging about element 51 by lugs 1I on said fingerwhich are bent around the vertical side edges of the rear wall of headelement 56. 'I'he finger 10 is held to slide up and down with itsstraight left hand edge against the abutment face of abutment portion 58of stop L as shown andhas a reduced lower end portion the width of whichlongitudinally of the stop bar I9 and transversely of the machine isless than the distance of one letter space travel of the carriage andequal to the extent of said normal overthrow. The reduced lower endportion of finger 10 is normally held up vby the detent device D highenough (as shown) to clear abutment I1 on the machine frame, but whendetent device D is pressed down to stop releasing position the finger 10moves down with it just farenough to interpose its said reduced lowerend portion between abutment 58 and abutment I1 so that the releasedstop L will engage abutment I1 through the medium of the auxiliaryabutment or finger 10. Stop L will therefore be stopped by stop I1 inproper position for latching of the stop L to bar I9 upon release ofhandle arm 31 in a stop setting operation for said stop L. When thedetent device D of said stop moves into latched engagement with theteeth of bar I9 on release of handle arm 31, the auxiliary abutment 10rises to normal position and the carriage stays in true letter spaceposition with the usual fractional letter space separation of abutmentsI1 and 58 until the carriage is fed leftward in typing the line.

The modified embodiment of the invention shown in Figs. 13 and 14adapted for wide carriage machines will now be described. The severalparts of the modified form of machine including the stops and theirsetting means, and

the mode of setting the stops, are the same as in the construction abovedescribed except as hereinafter pointed out. Like reference characchine.Such a Wide carriage (or still wider carriage) obviously requires theuse of a correspondsubstantially midway its ends and mid-width of.

the carriage. The adjacent ends of sections 3|a and 3|b have riveted inthe channels thereof `(as indicated at 12 in Fig. 14) lateral extensions14 of the side arms of a small and rigid metallic connecting yoke 15.The left hand side arm of yoke 15 has rigidly fixed thereto a trunnion16 which is coaxial with the two outer end trunnons 33 it andisjournaled in abearing hole in a sheet metal bearing bracket 11. TheAbearing hole in bracket 11 is coaxial with those in brackets 3U.Bracket 11 is rigidly held by a screw 18 to the upper end of a bracket19. Bracket 19 is held at its lower end to the carriage Il by screws 80and is located substantially midway between the ends of the carriage. l

The brackets 19 and l11 thus support and brace the stop releasing bar,and bracket 19 also supports and braces the long dentated margin stopbar I9 of the modified machine, said bar I9 being clamped midway betweenits ends to the rear face of bracket 19 by a shouldered screw 8| tappedrearwardly through the bracket.

Thecable 63 attached to spring drum 62 carried by the right hand marginstop R is, inthe modified construction, tied or otherwise anchored tothe protruding forward end of the shouldered screw 8| instead of beingtied or anchored to stop L. In the modified construction a spring drum62 similar to drum 62 is similarly journalled on the front wall 44 ofthebody of stop L, and the cable 63 of this drum 82 passes rightward fromthe lower part of the drum over an V idle guide pulley t1a (similar topulley s1) and is also tied or anchored to the forwardly protruding endof screw 8|. Pulley |51a is journalled on the front wall M of the bodyof stop L in the same manner that pulley 61 is journalled on stop R. Thespring of drum 62 constantly tends to turn said drum clockwise as viewedin Fig.rl3 and wind cable 63a on said'drum, as is. the case with drum62. By employingtwo spring drums `with their cables as shown anddescribed very small and inexpensive drums can be used in connectionwith wide carriages having a very long range of travel.

I What I claim is:

1. In a typewriting machine of the kind having` a main frame and anextra wide platen carriage mounted on the main frame to travel back andforth transversely of the machine, the combination with said mainframeand extra wide carriage of margin regulating means comprising, incombination, a dentated margin stop carrying bar fixedly supported onthe carriage at its ends adjacent opposite ends of the wide carriage, amanually-shiftable spring-returned marginstop releasing device extendingsubstantially from yend to end ofthe extra wide device extendingsubstantially from end to end ofthe extra wide carriage and oppositelyshiftable from an idler spring-returned position to either of two marginstop releasing positions, means on the extra wide carriage substantiallymidway between the ends of the carriage rigidly supporting the stop barandv also supporting the releasing device for shifting of the latter,means shiftably supporting said releasing device adjacent opposite endsof the -wide carriage, left andlright hand adjustably settable marginstops, releasable self-latchable means carried by each of said stops tolatch said stops to said bar, said stops being mounted on said bar forsliding adjustment therealong into different set and locked positionswith respect to said bar, said releasing device being operable upl ondifferent ones of said latching means of said margin stops when shiftedin different directionsl from its idle position for selectivelyreleasing the margin stops, motor means for driving the released stop`toward the other stop upon release of either stop, and counter stopmeans on the `machine frame intermediate the settable margin stopsforcoaction with the settable margin stops to determine the left andright hand margins of matter typed by the machine.

2. In a typewriting machine of the wide carl riage variety as claimed.in claim l, the self unlatched during driving thereof by the motorlatchable means of the left and right hand margin stops being eachprovided with an antifriction rollerengageable `by said oppositelyshiltable releasing device to unlatch the stop and hold-,it

means.

3. In a typewriting machine of the wide carria'ge variety as claimed inclaim 1, the selflatchable means of the left and right hand margin stopsbeing each provided with an antifriction roller engageable by saidoppositely shif'table releasing device to unlatch the stop andhold itunlatched during. driving thereof by the motor means, andv each of saidself-latchable means being also provided with a finger piece directlyoperable by hand to unlatch the stop and held it 4unlatched duringsliding direct hand adjustment of the released stop along the stop bar.v

4. In a typewriting or'like machine, a margin regulating meanscomprising, in combination, a margin stop carrying bar, left and righthand margin stops mounted on said bar and adjustably slidable therealongand each including releasable means for locking the stop to the bar indesired adjusted position, a single sheet metal releasing bar for thepair of margin stops,said bar being of channel form'in cross section andextending longitudinally of the stop bar, means `pressure of thelongitudinal edge of one flange of said releasing bar on the peripheryof said roller,

the rollers extending transverselyof the releasing bar and beingarranged for engagement of the periphery of each thereof by a differentilange of said releasing' bar, spring means for returning said releasingbar to and normally holding it in an intermediate idle position in whichboth margin` stops are locked to the stop bar, counter stop means forthe margin stops, said bars and `margin stops being mounted for relativetravel between the same and said counter stop means longitudinally ofthe bars with thecounter stop means located intermediate the two marginstops, and automatically operating means to slidably move along the stopbar toward the counter stop means that one 'ci the margin a main frameand a platen carriage mounted on the main frame to travel back and forthtransversely of the machine, wherein is provided margin regulating meanscomprising, in combination, a margin stop carrying bar fixedly mountedon the carriage adjacent opposite ends of the bar and carriage, means onthe carriage substantially midway between the ends of the bar andcarriage iixedly supporting said bar, left and right hand margin stopsadjustably slidable on the bar longitudinally of the bar and eachincluding a locking means normally releasably locking the stop to thebar in adjusted position, a single op positely shiftable releasing meansfor said margin stops extending longitudinally of said bar and supportedon the carriage adjacent opposite ends of the carriage and alsosupportedby said bar supporting means located midway between the ends ofthe carriage, said releasing means being normally spring held in anintermediate idle position and being operable by hand to act upon thelocking means of diilerent ones of the margin stops to unlock the stopand hold it unlocked throughout the eld of adjustment of the stop whensaid device is. shifted in different directions from its idle position,a spring drum of each margin stop, two cables each connected to adifferent one of said drums and to said central supporting means for thestop bar and releasing means for constantly urging the two stops towardeach other, and counter stop means for the margin stops mounted on themain frame between said stops.

6. A typewriting machine as claimed in claim 5, wherein the lockingmeans of each-margin stop includes a finger piece directly operable byhand to release the locking means of the stop and antifriction meanscarried by the locking means and engageable by said oppositely shiftablehand operable means to release the stop, and said lastmentioned meansextends longitudinally of the carriage between the finger piece and saidantifriction means.

'7. A typewriting machine of the kind having a margin stop supportingmeans, a pair of margin stops mounted on and independently` adjustablealong said supporting means and each including releasable locking meansnormally effective to lock the stop to its supporting means in aselected margin determining position, and counter stop means for saidmargin stops mounted therebetween for relative back and forth travelbetween the counter stop means and the margin stop supporting meansparallel to the typing line of the machine, wherein the said releasablelocking means'of each margin stop is provided with an antifrictionroller shiftable by pressure on its periphery to shift the locking meansto unlock the margin stop, a hand rockable stop-releasing bar of channelcross section extends longitudinally of the margin stop supporting meansand typing line of the machine in non-traveling relation to the marginstop supporting means andhas its opposite'side walls disposed forpressing engagement with the antifriction rollers of different marginstops when said bar is rocked in different directions, and means isprovided for restoring said bar to an intermediate idle position inwhich both margin stops are held locked by their locking means.

8. A typewriting machine as claimed in claim '7, wherein the releasablelocking means for each margin stop has a finger piece for direct handunlocking of the stop by direct hand pressure on tends between thefinger piece andl antifriction roller of each stop.

9. In a typewriting machine having a main frame and an escapementcontrolled carriage movable back and forth transversely of the mainframe, margin regulating means comprising, in combination, a dentatedmargin stop bar traveling with the carriage, a left hand margin stopmounted on said bar for adjustment therealong and including a shiftabledetent device shiftable to unlock the stop from the bar for adjustmentof the stop. and counter stop means on the main frame for said left handmargin stop. said margin stop having a main abutment engageable withsaid counter stop means in all locked adjusted positions ofthe stop and'an auxiliary abutment shiftable with said detent device to engage saidcounter stop means only while said detent device is in stop unlockingposition, said auxiliary abutment being arranged to engage the counterstop means, when said auxiliary abutment is rendered effective, at apoint a fraction of one letter space distance of travel of the carriagein advance of the point at which said main abutment would otherwiseengage the counter stop means.

10. In a typewriting machinehaving a main frame and anescapement-controlled traveling carriage reciprocable relatively to themain frame for letter-spacing and return movements of the carriage,margin-regulating means for determining the limit of return movement ofthe carriage comprising, in lcombination, a dentated margin stopcarrying bar extending parallel to the path of travel of the carriage,amargin stop vslidably adjustable along said bar, means carried by thesaid margin stop to releasably latch said stop to said bar at dierentletter-space intervals, counter-stop means engageable by said marginstop to arrest return movements of the carriage, said bar aridcounter-stopA means being mounted for relative travel therebetween inthe direction of the length yof the bar during carriage travel, andnormally ineffective means shiftable with the releasable latching meanscarried by said margin stop and automatically positioned by release ofsaid latching means for engagement with the counter-stop means uponrelative Asliding movement between the bar and margin stop to locatethemargin stop for relatching of the latter to the bar in position forcoaction of the margin stop with the cou'nter-stop means, duringsubsequent return movement of the carriage, to arrest the carriage.

the finger piece. and said stop releasing bar ex- 11. In a typewritingor like printing machine having a main frame and a paper carriage whichis movable back and forth parallel to the printing line of the machinefor letter-space feeding movement and return movement and isescapement-fed in letter-space feeding direction, a margin stop barextending parallel to the path -of movement of said carriage, a marginstop slidably adjustable along said bar and including means for normallyreleasably locking the margin stop to the bar in any selected one of aplurality of positions spaced apart at letter-space intervals along saidbar, counter-stop means for said margin stop, said bar and counter-stopmeans being mounted for relative travel in the direction of the lengthof said bar during feed and return movements of the carriage, and meanscarried by the margin stop for contact with the counter-stop means-andcomprising two abutments one of which is movable with the releasablelocking means to place it in position for contact with said counter-stopmeans while the margin stop is released'from said bar and movable out ofposition for contact with the counterstop means whenthe margin stop islocked to said bar, the other abutment being arranged for contact withthe counter-stop Ameans while the movement and return movement and isescapement-fed in letter-spacefeeding direction, a margin stopAbar-extending parallel to the path of movement o f said carriage, amargin stop slidably adjustable along said `bar and including means fornormally releasably locking the margin stop to the bar in any selectedone of a plurality of positions spaced apart at letter-space intervalsalong said bar, and counter-stop means for said margin stop, said barand counter-stop means being mounted for relative travel therebetween inthe direction of the length of said bar during feed and return movementsof .the carriage, said margin stop having two relatively shiftableabutments one positioned to engage the counter-stop means while the stopis locked to the bar and the other shiftable with the margin stoplocking means into position to engage the counter-stop means while thestop is released from the bar and shiftable out of said position whenthe margin stop is `locked to the bar, the latter abutment being locateda fraction of one l letter-spacein advance of the former abutment withrespect to the direction of return movement of the carriage.

13. A typewriting or like printing machine of the'kind having a mainframe and a paper carriage which is movable back and forth in a pathVparallel to `the printing line of the machine land is escapement-fed .inone direction of its travel for letter spacing, characterized in thatsaid machine is provided with margin-determining means comprising, adentated margin stop bar held to the carriage, a carriage returnlimiting margin stop slidably adjustable along said bar and includingreleasable latching means normally engageable with teeth ot said bar tolatch said stop to said bar at any selected one of a plurality ofletter-space intervals along the bar, counter-stop means on the mainframe for said margin sto'p, means "on the carriage independent of saidmargin stop operable to release said stop latching means and hold itreleased throughout the field of adjustment of said stop, and meansconstantly tending to urge said stop toward said counter-stop' means,said stop having two abutments for engaging said counter-stop means, oneof said abutments being shiftable with the margin stop latching meansinto position to engage said counter-stop means only while the stopr is.released `and being, when so positioned, interposed between the otherabutment and the counterstop means and a fraction of one letter-space'distance nearer the counter-stop means than said other abutment.

14. A typewriting or like printing machine of the .kind having a mainframe and a paper carriage which is movable back and forth in a'pathparallel to the printing line of the carriage and is escapement-fed inone direction of its travel for letter spacing, characterized in thatsaid machine is provided with margin-determining means comprising, incombination, a dentated margin stop bar held to the carriage to traveltherewith and lextending parallel to the pathof carriage travel, acarriage feed limiting margin stop and a carriage return limiting marginstop slidably adjustable along said bar and each including releasablelatching means engageable with teeth of said dentated bar for latchingit to the bar at selected intervals spaced letterspace distances apartalong the bar, counter-stop means for each margin stop mounted on themachine frame, means mounted on 'the carriage operable toselectivelyrelease the latching means of the margin stops and hold the releasedlatching means released throughout the ileld of adjustment of thereleased stop, and means constantly tending' to urge the margin stopstoward the counter-stop means, said carriage return limiting margin stophaving an abutment engageable with the counter-stop means for said stop,said carriage feed limiting stop having an abutment for engaging thecounter-stop means for said stop, and said carriage return limiting stopalone of said two margin stops having a normally ineffectivesupplemental abutment shiftable with the latching means for said stopand positioned by release of said latching means to engage thecounter-stop means for said stop,

'the supplemental abutment being engageable with the counter-stop meansto hold the other abutment of the carriage return limiting margin stop afraction of'one letter space away from the counter-stop means.

CHARLES WALKER.

WILLIAM A. GABarELsoN.

